Hello i received my ktuner unit i follow all the steps in the quick guide. For some reason I am having trouble, when i look on windows at the ktuner unit it says... Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)

Click 'Check for solutions' to send data about this device to Microsoft and to see if there is a solution available.

I've already installed the driver (zipped files) and i guess it wont load. Also when i open up ktuner software i am stuck at the account management and on things i am allowed to press is close or update. It will not let me register and it keeps saying wrong user name.

HI, I just that sime problem XP + SP3 and they don't work:"Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)""My system doesn't suport this language."

Update your system software. There's nothing in the driver file that prevents them from being installed on a properly up to date system. You can also use Zadig to force install WinUSB drivers. You'd need the XP version.